Though the original statement in the Wiki article is only a Google link to a book from 2015 which I can't seem to read more about? If 4 billion trees were affe

Though the original statement in the Wiki article is only a Google link to a book from 2015 which I can't seem to read more about? If 4 billion trees were affected in only a few years, people couldn't have chopped down so many trees, couldn't they? If there were natural resistant chest nuts at least a few should have endured.